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Control circuit for active noise control and method for active noise control

a control circuit and active noise technology, applied in the direction of active noise cancellation of hearing devices, signal processing, instruments, etc., can solve the problems of negative effects on the sound or music quality received by users, and achieve the effect of reducing unwanted effects on audio signals

Active Publication Date: 2017-10-03
AMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances sound reproduction quality by effectively reducing ambient noise without affecting the audio signal, achieving improved noise reduction in specific frequency ranges, including low frequencies.

Problems solved by technology

However, in existing solutions for ANC the incorporation of the correction signal may lead to negative effects on the sound or music quality received by the user.

Method used

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  • Control circuit for active noise control and method for active noise control
  • Control circuit for active noise control and method for active noise control

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Embodiment Construction

[0041]FIG. 1 shows an exemplary embodiment of a control circuit for ANC according to the improved concept. The control circuit comprises a first mixer M1 and a first amplifier AMP1 that is connected to the first mixer M1. Furthermore, the first amplifier AMP1 is coupled to a speaker SP that is for example part of a sound reproducing device, for example of a headphone. The sound reproducing device also comprises an ANC microphone MIC positioned at a location with respect to the speaker SP that allows detecting a sound similar to the sound heard by a user. The control circuit comprises a tuning unit TUNE with a second amplifier AMP2 coupled to the ANC microphone MIC and a second mixer M2 connected to the second amplifier AMP2. The control circuit further comprises an ANC filter ANCF coupled between the first mixer M1 and the second mixer M2. Finally, the control circuit comprises a compensation unit CU, in the shown embodiment represented by a frequency compensation unit FRU. The freq...

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PUM

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Abstract

We disclose a control circuit for active noise control, ANC, coupled to a speaker generating a speaker signal based on an amplified audio signal and to an ANC microphone generating a disturbed audio signal based on ambient noise and the speaker signal. The control circuit has a first mixer generating an intermediate audio signal by superposing an audio signal and a first compensation signal, a first amplifier generating the amplified audio signal based on the intermediate audio signal and a compensation unit generating a second compensation signal based on the audio signal. A tuning unit generates a compensated audio signal based on the disturbed audio signal and the second compensation signal. An ANC filter coupled to the tuning unit generates the first compensation signal by applying filter operations to the compensated audio signal.

Description

BACKGROUND OF THE INVENTION[0001]The present disclosure relates to a control circuit for active noise control and to a method for active noise control for sound reproduction devices, in particular for headphones.[0002]In sound reproduction devices, as for example headphones, active noise control, ANC, can be implemented. The goal of ANC is to reduce or remove unwanted external noise from the sound impression of a user. To this end, a microphone is situated at or inside the sound reproduction device recording sound corresponding to the sound or music received by the user including noise or other unwanted external sounds. For ANC the sound received by the microphone is evaluated and a correction signal is produced in order to minimize the effect of the environmental noise or other disturbing sounds.[0003]However, in existing solutions for ANC the incorporation of the correction signal may lead to negative effects on the sound or music quality received by the user.SUMMARY OF THE INVENT...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G10K11/16G10K11/178
CPCG10K11/1782G10K2210/3016G10K2210/3028G10K2210/30232H04R3/04H04R2430/00G10K11/17875G10K11/17827G10K11/17885G10K11/17825G10K11/17853H04R1/1083H04R2460/01
Inventor GETHER, HORSTSCHOERKMAIER, MARTIN
Owner AMS AG